From Dale Carnegie
Here are a few principles Dale Carnegie gives on being a leader:
1. Begin with praise and honest appreciation
2. Call attention to people’s mistakes indirectly
3. Talk about your own mistakes before criticizing the other person.
4. Ask questions instead of giving direct orders
5. Let the other person save face
6. Praise the slightest improvement and praise every moment. Be “hearty in your approbation and lavish in your praise.”
7. Give the other person a fine reputation to live up to.
8. Use encouragement. Make the fault seem easy to correct.
9. Make the person happy about doing the thing you suggest.